Work-holding means for grinding-machines, lathes, and like machine-tools.



A. W. SMITH. WORK HOLDING MEANS EOE GRINDING MACHINES, LATHES, AND LIKE MACHINE TooLs.

APPLICATION FILED JUNE 12, 1913. 1,100,265.

Patented June 16, 1914.

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, A. W. SMITH. l WORK HOLDING MEANS FOR GRINDING MACHINES, LA'IHES, AND LIKE MACHINE TDOLS.

APPLICATION FILED TUNE 12I 1913.

Patented June'16, 1914.

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UNITED STATES PATENT OFFICE.

ARTHUR W. SMITH, OF NEW YORK., N. Y.,

ASSIGNOR TO REMINGTON TYPEWRFLEIELl COMPANY, OF ILION, NEN' YORK, A. CORPORATION OF NEWZ'ORK.

Specification of Letters Patent.

Patented June 16, 1914.

Application led June 12, 1913K Serial No. 773,179.

To f/.ZZ 1c/wm 'it may concern.

Be it known that I, ARTHUR W.. SMrrr-I, citizen of the United States, and resident of the borough of Manhattan, city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in VVOrk-llolding .ileans for Grinding-Machines, Lathes, and like lVlachine-Tools, of which the following is a specification.

My invention relates to grinding machines, lathes and like machine tools and is directed more particularly to work holding means for such machines. Heretofore in grinding platens for typewriting machines it has been customary to provide separate work holding means or devices for platens equipped with distinctively different kinds of platen heads, line spacing wheels, etc.

One of the main objects of my present invention is to overcome the above mentioned disadvantages and to provide work holding means which are comparatively7 simple in construction, eflicient in use, and which are adapted to coperate with work of distinctively different character, or with platens, .for example, equipped with fittings having distinctly different characteristics.

To the above and other ends which will hereinafter appear, my invention consists in the features of construction, combinations of devices and arrangements of parts set forth in the following description and particularly pointed out in the appended claims.

In the accompanying` drawings wherein like reference characters indicate corresponding parts in the various views, Figure l is a fragmentary front elevation with parts in section of one form cf machine tool embodying my invention.

Figs. 2 to 7, inclusive, are detail fragmen` tary side views of typewriter platens with different forms of equipment or fittings with which the work holding devices of the present invention are adapted to cooperate. Fig. 8 is a fragmentary sectional view showing a portion of one of the work holding devices. Fig. 9 is a detail end view showing one of the working holding devices mounted in place on its work supporting member. Fig. 10 is a detail longitudinal sectional view of one of the detachable centers, the section being taken onthe line mof Fig. ll and looking in the direction of the arrow at said line. Fig. ll is an end view of the same looking in the direction of the arrow in Fig. 10.

ln order to more readily arrive at an understanding of the present invention and the character of work that it was devised more especially to accomplish, I have illustrated several platens for typewriting machines equipped with diderent characters of platen heads or fittings. These represent but comparatively few of the many differentially equipped platens that the work holding means of the present invention are adapted to co-act with to properly hold them in place and effect a rotation thereof in the grinding machine, though the plat-- ens illustrated will suffice to show the application of the invention under various conditions.

The body portion of each platen is represented by the reference numeral l although it will be understood that the diameters and lengths of these platens in different machines vary considerably as well as the platen heads, line spacing wheels, etc., mounted thereon. The body portion l of each platen has two heads secured thereto; one head, designated as a whole by the reference numeral 2, being' secured at one end of the platen, whereas the other head, designated as a whole by the reference numeral 3, is secured to the other end of the platen. These platen heads vary considerably in construction in different machines. One may have a comparatively long hollow sleeve or hub t projecting therefrom, as shown in Fig. 2, whereas another may have a relativelylong trunnion or solid spindle 5 projecting therefrom, as shown in Fig. 2. In other instances the platen heads 2 may have different forms of hubs da, lb, as shown in Figs. 3 and 4C respectively. Another form of platen head may not have a hub or projection but may have a central bearing opening 6 or Ga therein as shown in Figs. 3 and 5 respectively. Then again some platen heads may be formed with crown teeth 7 to provide a line spacing wheel, as shown in Fig. 4f. In other cases the line spacing teeth may be peripheral teeth, as shown at 8 in Figs. 5, 6 and 7. In some instances, instead of the line spacing wheels being formed on the platen heads they may be otherwise connected with the plalens and a head at one end of each of such platens is formed with an off-set aperture 9, asindicated in Figs. and 3. ln still other instances the platen head at one end of each plat-en is provided with a linger wheel 10, as shown in Fig. 4. The solid spindles or trunnions corresponding to the trunnions 5 also vary widely on different platens as will be seen from an inspection of the trunnions 1l and 12 as shown in Figs. 6 and 7 respectively. As hereinbefore indicated these represent but a comparatively few of the dierent styles of equipment on platens employed in different machines, and it should also be understood that the number of teeth on different line spacing wheels vary even in the saine character of constructions. By the present invention l provide vork holding means with the aid of which any one of these, and many other different styles and sizes of platensg may be readily connected to their driving means and properly positioned and centered in the grinding machine by which the surfaces of the platens may be ground. rhe means by which this :is accomplished are shown in Fig. 1 mounted in a conventionally represented grinding machine or lathe, only so much of said machine being shown as is necessary to an understanding of the invention in its embodiment therein. It will be understood that, so far as my present invention is concerned, any suitable grinding machine, lathe or machine tool may be employed, the novel devices of the present invention relating more particularly to work holding means.

The bed 13 of the machine in the present instance supports the usual head and tail stocks 14 and 15 respectively. The live spindle is driven by a pulley 1G and receives at the inner end thereof what l term a working supporting member 17 having a tapered end 18 for the reception in a corresponding opening in the inner end of the live spindle. The inner end of the work supporting member 17 is apertured to receive the tapering end 19 of a center 20. The working or engaging face 21 of this center is tapering for reception in the center openings of the hubs 4, 42t or 4b, or in the center openings 6a of the platen heads 2, the tapering of the center 20 enabling it to co-act with platen heads having different size central openings. The work supporting member 17 is provided with an eccentric bearing portion 22 surrounded by a sleeve 23 which constitutes a part of a work engaging member. Projecting inwardly from the edge of the sleeve, at one side thereof, is an extension 24 which is apertured in its end to receive the tapering portion 25 of an e` gaging pin 26, the pin projecting inwardly beyond the inner end of the extension 24,

The inner end of the extension 24 is also provided with an inwardly extending engaging tooth, pin or projection designated as a whole by the reference numeral 2T. This tooth has an ujgnvardljv extending lat face 2S the plane of which is radial with the center of the sleeve 23. The top of the tooth is beveled as indicated at 25) and is formed with an inclined face 30, so as to present a sharp working edge 31 and a sharp crown 32 parallel with the axial center of the spindles.` and is also formed with a sharp crown 32, the edge of which is at right angles to the axial center of the sleeve 23. The purpose of this is to provide engaging means adapted to cooperate with the crown line spacing ratchet teeth 7, or the peripheral line spacing teeth S on the platen heads 2 with equal facility. In the event of the tooth engaging the crown ratchet teeth an endwise engagement is eii'ected between the crown 32 of the engaging tooth and the teeth 7 of the ratchet wheel, whereas an engagement may be effected between the edge 31 of the tooth 27 and the peripheral ratchet teeth 8. This engagement provides an unlocking engagementJ between the engaging member and the platen head so as to connect and hold the platen for rotative movement with the live spindle.

In the event of the platen head 2 being provided with olf-set apertures 9 therein, and not having line spacing ratchet teeth formed thereon, then the engaging pin 26 will be used to effect an interlocking engagement between the platen head and the work engaging member, it being understood that the pin 2G is seated in an aperture 9 of the platen head 2. It will be understood, moreover, that when the engaging pin 26 is employed the tooth 27 will not be effective to cooperate with the platen head. whereas when the tooth 27 is used the pin 26 is removed to afford an engagement' between the tooth 27 and the teeth of the line spacing ratchet wheel.

rlhe sleeve 23 is fixed in position on the eccentric bearing member 22 by a set screw 33 which is received in a tapped opening in the sleeve and bears at its inner end against the surface of the eccentric. A loosening of the screw enables the sleeve to be turned on the eccentric or to be moved longitudinally thereof and the set screw is effective. to hold the sleeve against displacement from the position to which it has been adjusted. lt will be understood that a rotative adjustment of the engaging member ou the eccentric 22 is effective to move the tooth 27 and engaging pin 2G nearer to or farther from the lathe center indicated by the. dotted line a in Fig. 1. From an inspection of Fig. 9 this adjustment of the engaging devicesvtoward and from the axial line of the lathe centers will be readily understood. This the differences in the construction of theplaten heads 2 where, for example, they are provided with hollow spindles or hubs 4, 4a, 4b, or the platen heads have no such hubs and are merely provided with central bearing openings 6a. In the event of the platen heads 2 having solid spindles 34 or :55. as indicated in Figs. G and 7, the center 20 will be removed and the spindle 34 or :l5 will be seated directly in the bearing opening which receives the taper 19 ot the center 20, or in the extension of such opening. ln all of the instances shown the platen heads 2 are cooperative with the wort; holding devices carried by the live spindle, whereas the platen heads 3 are cooperative with work holding or support ing devices which are carried by the tail stock 15. These devices comprise a supporting member 3G tapered for reception in the inner apertured end of the dead spindle. An annular opening or ball channel 37 is formed at the inner end of the supporting member 36, the vertically disposed tace of such channel receiving the horizontal thrust ot' a circular series of anti-friction balls 38. The inner annular wall of the channel receives the lateral thrust ot the series of balls. A center-carrying member 39 is in the nature ot a hollow spindle which is received in and extends through to the outer end of the supporting memberl 36. The inner end portion of this center carrying member is termed with a cone 40 which bears against the circular series of antifriction balls 38. A. cylindrical dust guard or shield 4l is connected to the supporting member 36 and overlaps the joint between the cone 40 and the inner end of the supporting` member 36 in order to exclude dust or grit from the ball bearings. The outer end portion of the hollow center-carrier is internally threaded to receive the threaded portion 42 of a screw having an enlarged head 43. The under side of the head forms one wall of a bearing for a circularly arranged series of bearing balls 44, whereas a circumferential shoulder 45 on the screw forms another bearing` wall for the balls 44. The series of balls 44 also receives a bearing on the inclined face 46 at the inner end of the supporting member 36. If desired a sleeve 47 may be connected to the head 43 of the screw and ext-end inwardly to inclose the circular series of balls 44 in `order to exclude grit or dust from the bearings. n... set screw 48 is received .in a tapped opening in the center-carrier 39 and bears at its inner end againstI the unthreaded portion 49 oit the screw to retain it in the position to which it may be adjusted to regulate the pressure of the bearings against the balls, it being understood that the screw is effective to take up any lost motion and to compensate for any wear on the bearings. The set screw 4S may be introduced into its tapped opening through an aperture 50 provided with the supporting member 36.

The inner end ot' the center-support or carrier 36 has a tapering, opening to receive the tapered or conical end 5l ot a center provided with a tapering work engaging portion 58 which is angular in cross section, the center being shown rectangular in cross section in the present instance. ln some in stances this center may be replaced b v a hollow center designated as a whole by the reference numeral 54, and shown in detail in Figs. l() and 1l.. This center has a hollow tapering portit'm and an internally tapering serrated tace 56 to engage various characters of spindles or hubs such as the spindles 5, ll and l2, or the hub 57 on the platen heads 3. When the platen heads 3 are provided with central openings, such as that indicated at 6 in Fig. 3 or at 58 in Fig, 4, the center may be employed. It may also be used to cooperate with hollow spindles or hubs, such as the hub 57 in Fig. lt is believed that it will be unnecessary to indicate more specifically just how these work holding means co-act with the spindles, hubs or centrally apertured platen heads since it is believed that it will be apparent to those skilled in the art from what has been described.

From the foregoing description it will be understood that the work supporting or engaging means carried by the tail stock l5 are mounted on ball bearings to support the platen for rotative movement with the live spindle of the grinding machine and that the off-set work engaging means 2G, 27 are effective to engage the platen, or a part carried thereby, to tixedly connect the work or platen to the live spindle in order to rotate the platen therewith.

The work holding means shown and described are effective to c operate with many different styles of platens and the construction of the parts is such that they may be readily adjusted, regulated or set to co-act with the different size platens.

llVhile I have shown and described my invention embodied in a grinding machine or lathe, and while the invention was designed more especially for use in such machines and t'or more eitectively holding typewriter platens therein, it should be understood that the work holding devices of my invention have a wide range of use and that l do not limit myself to their embodiment in any particular character of machine tool, and that the invention may be employed for various kinds of work.

What l. claim as new and desire to secure hy Letters Patent, is

1. fork holding means for grinding machines lathes and like machine tools comprising a rotative supporting member having an eccentric bearing portion, and a work engaging member adjustably mounted on the eccentric bearing portion ot' said supporting member.

Q. fork holding means for grinding machines lathes and like machine tools comprising a rotative supporting member having an eccentric bearing portion, a work engaging member mounted on the eccentric bearing portion of said supporting member, and means for affording an adjustment oi said work engaging member on said eccentric portie-n both rotatively and axially otx said Supporting member.

Toi-k holding means for grinding machines lathes and like machine tools comprising a rotative supporting member having an eccentric bearing portion, a work engaging member adjustably mounted on the eccentric bearing portion of said supporting member, and a work engaging project-ion 'arried by said work engaging member.

4l.. Work holding` means for grinding machines lathes and like machine tools comprising a rotative supporting member having an eccentric bearing portion, and a work engaging member adjustably mounted on the eccentric bearing portion of said supporting member, said work engaging member having a work engaging tooth projecting therefrom and adapted to effect a sidewise or endwise engagement with the work.

Tork holding means for grinding machines lathes and like machine tools comprising a. rotative supporting member having an eccentric bearing portion, a work engaging member adjustably mounted on the eccentric bearing portion oi said supporting member, and a center carried bv said supporting member and having a conical work engaging face.

6. lVork holding means for grinding machines lathes and like machine tools comprising a` rotative supporting member having an eccentric bearing portion, a work engaging .member adjustably mounted on the, eccentric bearing portion ot said supporting member, and a center carried by and det achable rom said work supporting member.

7. fork holding' means for grinding machines lathes and like machine tools comprising a rotative supporting member having an eccentric bearing portion, a work engaging member mounted on the eccentric bearing portion ot said supporting member, means for atiiording an adjustment otE said work engaging member on said eccentric portion both rotatively and axiall)y of said supporting member, said engaging member having a work engaging tooth projecting therefrom. a work engaging pin carried by and detachable 'trom .said work engaging member, and a center carried b v and detachable ifrom said supporting member, said center having a conical work engaging tace.

S. Work holding means for grinding inachines lathes and like machine tools comprising a supporting member adapted to be detachably connected with the live spindle of the machine and having a bearing portion eccentric to the axial line oit' the centers, and a work engaging member mounted and rotatively adjustable on said eccentric bearing portion, said work engaging member having an engaging device at one side oit the axial center thereof, so that a rotative adjustment of the work engaging member on the eccentric bearing portion is effective to adjust said engaging device nearer to or farther from the axial line of the centers.

9. York holding means for grinding machines lathes and like machine tools comprising a. tooth beveled in two directions to engage crown or peripheral ratchet teeth on the work to be held, and means for atfording an adjustment of said tooth toward and away from the axial line of tln` centers as well as parallel therewith.

Signed at the borough oi: )'lanhat'tan. city of New York, in the county of New vYork. and State of New York, this 11th day otf June, A. D. 1913.

ARTHUR V. SMITH. lVitnesses CHARLES E. SMITH, M. F. HANNWEBER.

Copies of 'this patent may be obtained for five eents each, by addressing the Commissioner of Patents. Washington, D. C. 

